Re: 260GTX nvidia-drivers-190.42-r3 - powermizer issue
Even here one time a sudden crash happened (maybe twice) with battery power but I had given it no importance. If I'll get more trouble I will post my dmesg.
I can say that even if ACPI notice the transition from battery power to AC, it is not the same for nvidia-settings that continue to recognize the power present at boot but may be is a problem not directly related to nvidia-drivers... I will investigate